Plus, when to see a doctor.

These findings provide some evidence that reduced slow wave sleep (SWS) and rapid eye movement sleep (REM) may contribute to brain atrophy, thereby increasing the risk of Alzheimer disease (AD).

A woman in her 40s presented with progressive cognitive decline, expressive language difficulty and episodic confusion. Her initial symptoms were misattributed to psychiatric illness, and later to ...

Parkinson's disease does more than cause tremors and trouble walking. It can also affect sleep, smell, digestion and even thinking. NPR's Jon Hamilton reports on new research suggesting that's because ...

A large international study involving nearly 700 participants reveals that women with a precursor condition to Parkinson's disease show significantly less brain atrophy—decreased cortical thickness in ...